updating GCE to use v1beta16, since v1beta15 is now deprecated
always set x-forwarded-proto and ssl to prevent malicious overwritting
always erasing local appcontroller state when tearing appscale down
making sure that zookeeper owns all folders in the zookeeper directory, not just the directory itself
Merge pull request #799 from simplysoft/nginx_x-forwarded-ssl

Prevent malicious overwriting of x-forwarded-proto and ssl
Merge pull request #805 from shatterednirvana/ensure-permissions-are-set-on-zookeeper

Making sure that zookeeper owns all folders in the zookeeper directory
Merge pull request #791 from shatterednirvana/gce-v1beta16

Updating GCE to use v1beta16, since v1beta15 is now deprecated
Merge pull request #800 from shatterednirvana/erase-local-state-on-down

always erasing local appcontroller state when tearing appscale down